PPI Pixels per inch: the amount of pixels of a digital image or physical screen that occupy 1 inch of physical space.
Bits per Pixel The amount of bits (1's and 0's) necessary to store the color data of a single pixel in a digital image.
Kilo, Mega, Giga, Tera Kilo is 1000, mega is 1 million (or a thousand kilos), giga is 1 billion (or a thousand megas), tera is 1 trillion (or a thousand gigas).
bpp Bits per pixel: unit of measurement for how many bits are necessary to encode the data of one pixel of an image, e.g. 1bpp, 8bpp, 24bpp, 32bpp.
Hz Abbreviation of Hertz, an unit of measurement for how many times per second a cyclic process is executed.
Hertz An unit of frequency that measures how many times per second a process occurs, for processes that occur in repeating cycles.